<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
      <el-header>
        <div class="headerLeft">
          <img src="../assets/logoIcon.png">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
      <!-- 页面主体区域 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="collapseBOLL ? '64px' : '200px'">
          <div class="toggleBtn" @click="toggleCollapse">|||</div>
          <!-- 侧边栏菜单区 -->
          <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409bff"
            unique-opened
            :collapse="collapseBOLL"
            :collapse-transition="false"
            router
            :default-active="activePath">
            <!-- 一级菜单 -->
            <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单模版区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span> {{item.authName}} </span>
            </template>
              <!-- 二级菜单 -->
              <el-menu-item :index=" '/' + subItem.path " v-for="subItem in item.children" 
              :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span> {{subItem.authName}} </span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <!-- 页面右侧主体区域 -->
        <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
        </el-main>
      </el-container>
  </el-container> 
</template>

<script>
export default {
  data(){
    return {
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-lunkuohua2_yonghu',
        '103': 'iconfont icon-lifangtilitiduomiantifangkuai2',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-dingdan',
        '145': 'iconfont icon-shuju'
      },
      // 是否折叠
      collapseBOLL: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created(){
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods:{
    logout(){
      // 清空token
      window.sessionStorage.clear()
      // 跳转到登录页
      this.$router.push('/login')
    },
    // 获取左侧菜单列表请求
    async getMenuList(){
      const {data: res} = await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.meg);
      this.menuList = res.data
      console.log(JSON.stringify(this.menuList))
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.collapseBOLL = !this.collapseBOLL
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style scoped>
.home-container{
  height: 100%;
}

.el-header{
  background-color: #373D41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
}

.el-header .headerLeft{
  display: flex;
  align-items: center;
}

.el-header .headerLeft span{
  margin-left: 15px;
}

.el-aside{
  background-color: #333744;
}

.el-menu{
  border-right: none;
}

.el-main{
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 6px;
}

.toggleBtn {
  background-color: #4a5064;
  text-align: center;
  font-size: 12px;
  color: #fff;
  line-height: 24px;
  letter-spacing: 0.3em;
  cursor: pointer;
}
</style>